<!DOCTYPE html>
<html>
<head>
<style type="text/css">

.hideradios input {
  display: none;
}

label[for="a2"],
label[for="b2"] {
  background-color: yellow;
}

</style>

</head>

<body>

<div>
<div><input type="radio" name="a" id="a1"><label for="a1">radio #a1</label></div>
<div><input type="radio" name="a" id="a2" checked><label for="a2">radio #a2</label></div>
<div><input type="radio" name="a" id="a3"><label for="a3">radio #a3</label></div>
<div><input type="radio" name="a" id="a4"><label for="a4">radio #a4</label></div>
<div><input type="radio" name="a" id="a5"><label for="a5">radio #a5</label></div>
</div>

<div class="hideradios">
<div><input type="radio" name="b" id="b1"><label for="b1">radio #b1</label></div>
<div><input type="radio" name="b" id="b2" checked><label for="b2">radio #b2</label></div>
<div><input type="radio" name="b" id="b3"><label for="b3">radio #b3</label></div>
<div><input type="radio" name="b" id="b4"><label for="b4">radio #b4</label></div>
<div><input type="radio" name="b" id="b5"><label for="b5">radio #b5</label></div>
</div>

</body>
</html>
